We thank our student-tutors, who have helped develop (proofreading and translation into French) and test the feasibility of image tests in their tutorials: Arthur Delmares, Laurence Hiroux, Lionel Tocaven, Pierre Feydel, Romain Carmeille, Cecilia Saubusse, Antoine Bremond, Loic Charles, Dylan Coutou-Picard, Priscilla David, Céline Faucart, William Froger, Emmanuel Esperou, Guillaume Hervot, Romain Mazeau, and Khalil Rouibi. We thank Elisabeth Génot, Thomas Daubon, Isabel Egana, Filipa Curado, and Paolo Ciufici, all members of the Signal Transduction lab at the Institut Européen de Chimie et Biologie (IECB), Pessac, for monitoring the test sessions. Lena Tibell (University of Linkoping, Sweden) is acknowledged for her help with the test protocol. We thank Graham Johnson (University of California at San Francisco, San Francisco, CA), Paul Craig (Rochester Institute of Technology, Rochester NY), and Andrew Goldsborough (IECB, Pessac, France) for helpful comments and text corrections. We thank Rainer Bromme (University of Muenster, Germany), Ton de Jong (University of Twente, Netherlands), and Rob Goldstone (Indiana University, Bloomington, IN) for their stimulating email discussions.